IOTA/IOTA-ES occultation update for (196) Philomela / UCAC4 308-186448 event on 2023 Jul 26, 06:13 UT Visible from South America Summary ------- On 2023 Jul 26 UT, the 140.1 km diameter asteroid (196) Philomela will occult a 11.8 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.55 mag to 11.36 mag (the magnitude of the asteroid) for at most 16.560 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2023 Jul 26, 06:01 - 2023 Jul 26, 06:27 * geocentric midpoint of event [JD]: 2460151.75994675 * magnitude of target star: 11.80 * magnitude drop [mag]: 0.55 * estimated maximum duration [s]: 16.560 * Moon: 53 % sunlit, 56° distance * Sun: 149° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 142 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.033, +/- 0.019) * 1 sigma uncertainty ellipse (major, minor, PA): (0.033", 0.019", 97°) * approx speed of asteroid's shadow [km/s]: 8.4616 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 308-186448 by 196 Philomela on 2023 Jul 26 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 135 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -13 57 58 .. .. .. -14 17 33 .... 136 0 0 -13 47 3 6 26 44.5 1 119 30 -13 3 9 -14 31 2 -12 43 42 -14 50 35 .... 137 0 0 -14 19 56 6 26 44.2 2 119 29 -13 36 5 -15 3 52 -13 16 39 -15 23 24 0.17 138 0 0 -14 52 36 6 26 43.5 3 119 28 -14 8 48 -15 36 29 -13 49 23 -15 55 59 0.16 139 0 0 -15 25 1 6 26 42.6 4 118 26 -14 41 16 -16 8 51 -14 21 52 -16 28 20 0.15 140 0 0 -15 57 12 6 26 41.3 5 118 25 -15 13 30 -16 40 58 -14 54 8 -17 0 26 0.14 141 0 0 -16 29 7 6 26 39.9 6 118 24 -15 45 28 -17 12 50 -15 26 8 -17 32 16 0.14 142 0 0 -17 0 45 6 26 38.1 7 118 23 -16 17 10 -17 44 24 -15 57 51 -18 3 49 0.14 143 0 0 -17 32 6 6 26 36.1 9 117 22 -16 48 35 -18 15 42 -16 29 18 -18 35 4 0.14 144 0 0 -18 3 9 6 26 33.8 10 117 21 -17 19 43 -18 46 41 -17 0 27 -19 6 2 0.14 145 0 0 -18 33 54 6 26 31.3 11 117 20 -17 50 32 -19 17 21 -17 31 18 -19 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26 14 -10 32 58 0.14 - 43 0 0 - 8 56 11 6 2 18.5 14 243 -44 - 8 12 20 - 9 40 7 - 7 52 54 - 9 59 39 0.14 - 42 0 0 - 8 22 47 6 2 14.9 13 242 -43 - 7 38 56 - 9 6 43 - 7 19 30 - 9 26 15 0.14 - 41 0 0 - 7 49 20 6 2 11.6 12 242 -42 - 7 5 29 - 8 33 16 - 6 46 3 - 8 52 48 0.14 - 40 0 0 - 7 15 51 6 2 8.6 11 242 -41 - 6 32 0 - 7 59 47 - 6 12 34 - 8 19 18 0.15 - 39 0 0 - 6 42 21 6 2 5.8 10 242 -40 - 5 58 31 - 7 26 16 - 5 39 5 - 7 45 47 0.15 - 38 0 0 - 6 8 51 6 2 3.3 9 242 -39 - 5 25 1 - 6 52 45 - 5 5 35 - 7 12 16 0.15 - 37 0 0 - 5 35 21 6 2 1.1 8 242 -38 - 4 51 33 - 6 19 14 - 4 32 7 - 6 38 45 0.15 - 36 0 0 - 5 1 53 6 1 59.3 7 242 -37 - 4 18 6 - 5 45 45 - 3 58 41 - 6 5 15 0.16 - 35 0 0 - 4 28 28 6 1 57.7 5 242 -35 - 3 44 43 - 5 12 18 - 3 25 18 - 5 31 48 0.17 - 34 0 0 - 3 55 7 6 1 56.4 4 242 -34 - 3 11 23 - 4 38 55 - 2 52 0 - 4 58 24 0.18 - 33 0 0 - 3 21 50 6 1 55.4 3 242 -33 - 2 38 8 - 4 5 37 - 2 18 46 - 4 25 5 0.20 - 32 0 0 - 2 48 40 6 1 54.7 2 241 -32 - 2 5 0 - 3 32 24 - 1 45 38 - 3 51 51 0.24 - 31 0 0 - 2 15 36 6 1 54.3 1 241 -31 - 1 31 58 - 2 59 17 - 1 12 38 - 3 18 43 0.38 - 30 0 0 .. .. .... .. .. .. .. .. .. .. .. .. - 2 26 18 .. .. .. - 2 45 43 .... Uncertainty in time = +/- 6 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4 308-186448 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 28.2670 DE: -28 34 22.725 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 10 28.2670 DE: -28 34 22.725 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (196) Philomela asteroid class: approx. diameter [km]: 140 approx. diameter ["]: 0.090 distance from Earth [AU]: 2.15040 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#130 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.033", 0.019", 96.591° remarks: * orbital elements for (196)Philomela : Mean anomaly = 6.1082209358 deg Arg. of pericenter = 203.5876181209 deg Long. of node = 72.2984428687 deg Inclination = 7.2628085925 deg Eccentricity = 0.0148135346 Semimajor axis = 3.1130648785 AU Perihelion dist = 3.0669493843 AU Mag: H = 6.63, G = 0.15 Epoch of elements : MJD 60151.25958333 TDT (2023 Jul 26.2596) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1302023Apr24,16.56,2023,7,26,6.238722,0.017034,-0.148586,-4.744787,-0.545037,0.002866,0.000495,0.000001,0.000000 -124.2756,-28.5689,88.07,19.48,False UCAC4 308-186448,18.17451862,-28.5729791,0.00,11.80,0.00,0.0,0,,18.19961596,-28.5689189,0.56,0.00,0,0,1 196,Philomela,11.36,140.1,2.1504,0,0,-1.472,-2.23,,8.0,0 0,6.0616,2023,7,26,203.5876,72.2984,7.2628,0.01481,3.11306,3.06695,6.63,5.0,0.15 1.222,0.0327,0.0190,97,0.0199,Known errors,-1.00,-1,-1,-1 20230726_186448,60092.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org